features

　　§-true-ground interface to an rs-232 com port for reading and writing 1-wire® devices

　　§-works with bipolar as well as unipolar logic signals

　　§-compatible to com port of (±)5v to (±)12v(db9 version only) or (±)6v to (±)12v (db25

　　version)

　　§- supports reading and writing at standard and overdrive speeds

　　§- provides strong pullup to 5v for temperature and eeprom 1-wire devices

　　§- programs 1-wire eprom devices (db-25version with external 12v power supply only)

　　§- communicates at data rates of 9.6kbps(default), 19.2kbps, 57.6kbps, and 115.2kbps

　　§- standard db9 or db25 female connector and 6-lead rj11 connector for easy attachment

　　of standard 1-wire cables and probes

　　§- includes ds2502 identification chip(ds9097u-009 only)

　　deion

　　the ds9097u is a sophisticated rs-232 to 1-wire adapter, which performs rs-232 level conversion and activelygenerates the 1-wire communication signals. together with an adequate software driver, it enables a windows®-based pc to directly communicate with any 1-wire device connected to the adapter’s rj11 port. the db9 versionreads and writes any non-eprom 1-wire device. to write to eprom devices, the db25 version with externalpower supply is required. for a list of suitable 1-wire network cables, refer to the connectivity matrix table in theds1402x 1-wire network cables data sheet.

　　all ds9097u adapters are based on the ds2480b serial 1-wire line driver chip. the rxd/txd polarity select inputof the ds2480b is connected to vdd (noninverting).

　　free software drivers can be downloaded

　　the ds9097u communicates with 1-wire devices at standard speed as well as overdrive speed. the serial portmust support a data transmission rate of 9600bps. under software control, the adapter can be set up for rs-232data rates of 19200bps, 57600bps, and 115200bps. the two higher rates are recommended for communication atoverdrive speed with overdrive-capable devices. since the ds9097u operates in a byte mode, every data bytereceived from the rs-232 port generates eight time slots on the 1-wire line.

　　note that there are some com ports that use signal levels of less than (±) 5v. the db9 versions of this adapter donot work with such ports. the ds9097u-e25 adapter, however, functions in most cases if external power issupplied. without eprom programming, the external power can be anywhere in the range of 6v to 9v. foreprom programming the voltage must be at 12v in any case. before using an externally powered ds9097u-e25with a com port of less than (±) 5v, check whether the com port will not be damaged by 5v on its rxd input.

　　? 李 进

　　? 深圳博瑞图电子科技有限公司

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　　?qq : 52519094

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